| Research Articles |
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| Effects of cotton field management practices on soil CO2 emission and C balance in an arid region of Northwest China |
| QianBing ZHANG1,2, Ling YANG1, ZhenZhu XU3, YaLi ZHANG1, HongHai LUO1, Jin WANG4, WangFeng ZHANG1 |
1 Key Laboratory of Oasis Ecology Agriculture of Xinjiang Production and Construction Groups, College of Agriculture, Shihezi Univer¬sity, Shihezi 832003, China;
2 College of Animal Science & Technology, Shihezi University, Shihezi 832003, China;
3 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
4 Wulanwusu Agrometeorological Experiment Station of Xinjiang, Shihezi 832003, China |
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Abstract Changes in both soil organic C storage and soil respiration in farmland ecosystems may affect atmospheric CO2 concentration and global C cycle. The objective of this field experiment was to study the effects of three crop field management practices on soil CO2 emission and C balance in a cotton field in an arid region of Northwest China. The three management practices were irrigation methods (drip and flood), stubble managements (stubble-incorporated and stubble-removed) and fertilizer amendments (no fertilizer (CK), chicken manure (OM), inorganic N, P and K fertilizer (NPK), and inorganic fertilizer plus chicken manure (NPK+OM)). The results showed that within the C pool range, soil CO2 emission during the whole growing season was higher in the drip irrigation treatment than in the corresponding flood irrigation treatment, while soil organic C concentration was larger in the flood irrigation treatment than in the corresponding drip irrigation treatment. Furthermore, soil CO2 emission and organic C concentration were all higher in the stubble-incorporated treatment than in the corresponding stubble-removed treatment, and larger in the NPK+OM treatment than in the other three fertilizer amendments within the C pool range. The combination of flood irrigation, stubble incorporation and application of either NPK+OM or OM increased soil organic C concentration in the 0−60 cm soil depth. Calculation of net ecosystem productivity (NEP) under different management practices indicated that the combination of drip irrigation, stubble incorporation and NPK+OM increased the size of the C pool most, followed by the combination of drip irrigation, stubble incorporation and NPK. In conclusion, management practices have significant impacts on soil CO2 emission, organic C concentration and C balance in cotton fields. Consequently, appropriate management practices, such as the combination of drip irriga¬tion, stubble incorporation, and either NPK+OM or NPK could increase soil C storage in cotton fields of Northwest China.
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Received: 13 July 2013
Published: 12 August 2014
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| Fund: The National Basic Re¬search Program of China (2006CB708401) and the Doctor Subject Foundation of the Ministry of Education of China (20116518110002). |
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Corresponding Authors:
WangFeng ZHANG
E-mail: zhwf_agr@shzu.edu.cn
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